Apple has released iOS 7.1 - the latest free upgrade to its software that runs the iPhone, iPad and iPad Touch (note that while it's free, iOS 7.1 weighs in at a hefty 2.5GB, so make sure you're on the boss's wi-fi before you download it).

The update adds support for Apple's new CarPlay technology, which will sync with built-in displays from most major car makers over the next few months to year.

On a more everyday level, iOS 7 lets you manually control Siri by holding down the Home button then releasing it when you've stopped voicing an instruction. No more awkward pauses.

The update also includes several security and stability bug fixes (including a gremlin that crashed the iPhone 5s) and boosts performance on the iPhone 4.

Apple says the update also improves fingerprint recognition on the iPhone 5s. It also adds the ability to automatically enable HDR on the 5s.

iOS 7 is compatible with the iPhone 4, 4S, 5, 5C, and 5S; the iPad 2, both Retina iPads, both iPad minis, and the iPad Air; and the fifth-generation iPod Touch.